What is a Generator Transfer Switch?

A generator transfer switch switches the electric power from the utility supply to the generator.

Generator Transfer Switch Types

Automatic Transfer Switch

Manual Transfer Switch

When planning your generator installation you can choose an automatic transfer switch or a manual transfer switch.
AUTOMATIC TRANSFER SWITCH - Safely disconnects the utility line and simultaneously connects a new power line from the generator.  Power is restored within seconds.
MANUAL TRANSFER SWITCH - This switch is installed right beside your electric panel and is connected to the circuits you want to run during a power outage.  When the power goes out, you'll need to take your portable generator out of storage and connect a power cord between it and the transfer switch.
Manual switches are generally for portable #Generators.  They are somewhat less expensive than the automatic switches and they can be used with permanent generators.  However, you'll have to go outside during inclement weather and manually flip the switch.  This doesn't make a whole lot of sense. The purpose of a permanent standby generator is the convenience of having the generator automatically sense the blackout.  Another disadvantage is that, depending on which circuits you've backed up, you'll have to guess when the power is restored.  You can watch the neighbors lights or a certain circuit in your home for your cue, but that's a pain.  The manual option also means that someone will have to be home to turn the switch on and off.  If you're on vacation, you're out of luck!

This is Generac's Smart Switch.  It is engineered with Digital Power Management technology.  This means you are able to use a smaller generator by using something called smart load management. If it's unlikely you'll turn on every appliance at the same time, a smaller unit with a smart power management generator transfer switch can be used.  This is a less expensive way to backup your entire house.  Here's how it works... To eliminate overload, non essential circuits are shut off when the standby unit approaches maximum capacity.  Then they are cycled back on when essential circuits are satisfied. Air conditioners, clothes dryers and hot tubs are considered non-essential circuits.

Per the National Electrical Code (NEC), all transfer switches must have a three-position “LINE-OFF-GENERATOR” or “ON-OFF-ON” switch to keep power from accidentally back feeding. The three-position switch ensures that the switch goes through the off position when traveling from the generator position to the line position, fully disconnecting the unit every time before the main utility switch is turned on.